Display device and mobile electronic device including the same

Abstract

A display device that may include a substrate, a driving element layer disposed on the substrate, and a light emitting element layer disposed on the driving element layer. The light emitting element layer may include a pixel defining layer including a plurality of openings defining a corresponding plurality of pixels, a first electrode disposed in each of the pixels and including a first portion covered by the pixel defining layer and a second portion extending from the first portion and corresponding to one of the openings of each of the pixels,, an intermediate layer covering the second portion of the first electrode in the openings of each of the pixels, covering the pixel defining layer between neighboring pixels, and including an electrically disconnected portion corresponding to the heating wiring.

What is claimed is: 
     
         1 . A display device comprising:
 a substrate;   a driving element layer disposed on the substrate; and   a light emitting element layer disposed on the driving element layer,   wherein the light emitting element layer comprises:
 a pixel defining layer including a plurality of openings defining a corresponding plurality of pixels; 
 a first electrode disposed in each of the plurality of pixels and comprising a first portion covered by the pixel defining layer and a second portion extending from the first portion and corresponding to one of the openings; 
 a heating wiring disposed on an upper surface of the pixel defining layer to surround at least a portion of each of the plurality of openings; 
 a connection electrode connecting the heating wiring and the first portion of the first electrode through a contact hole penetrating the pixel defining layer; 
 an intermediate layer covering the second portion of the first electrode and the pixel defining layer disposed between neighboring pixels, the intermediate layer including an electrically disconnected portion corresponding to the heating wiring in a plan view; and 
 a second electrode being continuous and covering portions of the intermediate layer disposed in the openings of each of the pixels and covering portions of the intermediate layer and the heating wiring disposed between the neighboring pixels. 
   
     
     
         2 . The display device of  claim 1 , wherein the driving element layer comprises a joule heating driver disposed to correspond to a non-display area of the substrate and configured to sequentially supply a heating scan signal to a plurality of heating scan wirings disposed in a display area of the substrate. 
     
     
         3 . The display device of  claim 2 , wherein the driving element layer further comprises a switching circuit disposed to correspond to the non-display area of the substrate and configured to supply a joule heating voltage to a plurality of heating voltage supply wirings disposed in the display area of the substrate in synchronization with a timing at which the joule heating driver outputs the heating scan signal. 
     
     
         4 . The display device of  claim 3 , wherein
 the switching circuit comprises a plurality of switching transistors electrically connected one-to-one to the plurality of heating voltage supply wirings, and   each of the plurality of switching transistors is turned on in response to a heating control signal and configured to output the joule heating voltage in case of being turned on.   
     
     
         5 . The display device of  claim 4 , wherein the heating control signal is synchronized with the heating scan signal. 
     
     
         6 . The display device of  claim 3 , wherein the heating voltage supply wirings intersect the heating scan wirings. 
     
     
         7 . The display device of  claim 3 , wherein
 the driving element layer further comprises a pixel driving circuit disposed in the display area of the substrate to correspond to each of the pixels, and   the pixel driving circuit comprises:
 a driving transistor supplying a designated driving current to a first node electrically connected to the first electrode based on a data signal input from a data line; and 
 a heating transistor turned on in response to the heating scan signal input from a heating scan wiring and supplying the joule heating voltage input from a heating voltage supply wiring to the first node in case of being turned on. 
   
     
     
         8 . The display device of  claim 7 , wherein the heating wiring is configured to receive the joule heating voltage via the first electrode and the connection electrode. 
     
     
         9 . The display device of  claim 8 , wherein a resistance of the heating wiring is greater than each of a resistance of the first electrode and a resistance of the connection electrode. 
     
     
         10 . The display device of  claim 1 , wherein
 the intermediate layer comprises at least one conductive layer including a portion electrically disconnected at a location corresponding to the heating wiring, and   the at least one conductive layer comprises a layer selected from a hole injection layer, a hole transport layer, an electron transport layer, a charge generation layer, and a P-doped layer.   
     
     
         11 . The display device of  claim 1 , wherein
 in a plan view, the heating wiring surrounds each of the openings in the pixel defining layer, and   the heating wiring comprises an open slit area open at a specific lateral direction.   
     
     
         12 . The display device of  claim 11 , wherein the intermediate layer and the second electrode are continuous without being electrically disconnected at a location corresponding to the open slit area. 
     
     
         13 . A mobile electronic device comprising a display panel, wherein the display panel comprises:
 a substrate;   a driving element layer disposed on the substrate; and   a light emitting element layer disposed on the driving element layer,   wherein the light emitting element layer comprises:
 a pixel defining layer including a plurality of openings defining a corresponding plurality of pixels; 
 a first electrode disposed in each of the plurality of pixels and comprising a first portion covered by the pixel defining layer and a second portion extending from the first portion and corresponding to one of the openings; 
 a heating wiring disposed on an upper surface of the pixel defining layer to surround at least a portion of each of the plurality of openings; 
 a connection electrode connecting the heating wiring and the first portion of the first electrode through a contact hole penetrating the pixel defining layer; 
 an intermediate layer covering the second portion of the first electrode and the pixel defining layer disposed between neighboring pixels, the intermediate layer including an electrically disconnected portion corresponding to the heating wiring in a plan view; and 
 a second electrode being continuous and covering portions of the intermediate layer disposed in the openings of each of the pixels and covering portions of the intermediate layer and the heating wiring disposed between the neighboring pixels. 
   
     
     
         14 . The mobile electronic device of  claim 13 , wherein the driving element layer comprises a joule heating driver disposed to correspond to a non-display area of the substrate and configured to sequentially supply a heating scan signal to a plurality of heating scan wirings disposed in a display area of the substrate. 
     
     
         15 . The mobile electronic device of  claim 14 , wherein the driving element layer further comprises a switching circuit disposed to correspond to the non-display area of the substrate and configured to supply a joule heating voltage to a plurality of heating voltage supply wirings disposed in the display area of the substrate in synchronization with a timing at which the joule heating driver outputs the heating scan signal. 
     
     
         16 . The mobile electronic device of  claim 15 , wherein
 the switching circuit comprises a plurality of switching transistors electrically connected one-to-one to the plurality of heating voltage supply wirings, and   each of the plurality of switching transistors is turned on in response to a heating control signal and configured to output the joule heating voltage in case of being turned on.   
     
     
         17 . The mobile electronic device of  claim 16 , wherein the heating control signal is synchronized with the heating scan signal. 
     
     
         18 . The mobile electronic device of  claim 15 , wherein the heating voltage supply wirings intersect the heating scan wirings. 
     
     
         19 . The mobile electronic device of  claim 15 , wherein
 the driving element layer further comprises a pixel driving circuit disposed in the display area of the substrate to correspond to each of the pixels, and the pixel driving circuit comprises:   a driving transistor supplying a designated driving current to a first node electrically connected to the first electrode based on a data signal input from a data line; and   a heating transistor turned on in response to the heating scan signal input from a heating scan wiring and supplying the joule heating voltage input from a heating voltage supply wiring to the first node in case of being turned on.   
     
     
         20 . The mobile electronic device of  claim 19 , wherein the heating wiring is configured to receive the joule heating voltage via the first electrode and the connection electrode.